Gedafe (Generic Database Front-End) is an application independent end-user web front-end for databases. Application independant means that the front-end doesn't have any information about the structure and contents of the database.

PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRI's SDE or Oracle's Spatial extension.

Emdros is a corpus query system for storing and searching linguistically annotated text. It is very generic, supporting almost any kind of annotation from almost any linguistic theory. All linguistic levels of analysis are supported, including phonology, morphology, the lexical level, syntax, and discourse. The core libraries act as a middleware layer between a client and an underlying SQL database. MySQL, PostgreSQL, and SQLite (2 and 3) are supported.

CloverETL is Java-based tool/framework for data
integration and creation of data transformations.
It is component based and follows the concept of
transformation graphs which consist of individual
nodes/components performing simple (or complex)
operations on data. Any transformation can be
defined as a set of interconnected nodes through
which data flows. CloverETL can be used as a
standalone application or be embedded into a
larger project.

H2 is an SQL database engine written in Java that
implements the JDBC API. Embedded, server, and
clustering modes are available. A browser based
console application is included. The database has
strong security features. Disk based and in-memory databases and tables are supported.

SymmetricDS provides file and database synchronization with support for multi-master replication, filtered synchronization, and transformation across the network in a heterogeneous environment. It supports multiple subscribers with one-direction or bi-directional, asynchronous data replication. It uses Web and database technologies to replicate data as a scheduled or near-realtime operation. The software has been designed to scale for a large number of nodes, work across low-bandwidth connections, and withstand periods of network outage. It works with most operating systems, file systems, and databases, including Oracle, MySQL, MariaDB, PostgreSQL, MS SQL Server (including Azure), IBM DB2, H2, HSQLDB, Derby, Firebird, Interbase, Informix, Greenplum, SQLite (including Android), Sybase ASE, and Sybase ASA (SQL Anywhere) databases.

TurnKey PostgreSQL Appliance is a server appliance for PostgreSQL, a fully-featured object-relational database with many enterprise features: ACID transactions, inheritance, Unicode, and strong support for the SQL-92 standard including subqueries, views, outer joins, foreign keys, sequences, and triggers. It is designed to be easy to use and easy to maintain. Security patches are automatically installed. It provides a Web management interface, configuration console, and an AJAX Web shell. To minimize footprint the appliance is built from the ground up with the minimum required components. It runs everywhere thanks to multiple build formats, including an installable live CD, a VMDK with OVF support, and an Amazon EC2 AMI.

TurnKey MySQL is an extremely easy way to get up and running with MySQL in just a couple of minutes. It's a pre-integrated turnkey server based on Ubuntu that is packaged as a Live CD image capable of supporting installations on both physical and virtual machines, including VMWare, Xen, VirtualBox, and KVM. It features a small footprint, automatic security updates, a rich Web administration interface, and an easy to use configuration and installation console. It includes a phpMyAdmin database management front-end.

iODBC is a cross-platform Driver Manager that comforms to the Microsoft ODBC 2.x & 3.x and X/Open SQL CLI data access specs. It enables the development of database-centric solutions that are both database and platform independent. This is a great SDK for porting WIN32-based ODBC applications to Linux and other OS platforms.

deltasql is a tool to synchronize databases with
source code, which helps to keep database
evolution under control. While developing
mid-sized or big applications, developers make
changes to the data model that go along with
changes to the source code. From time to time,
branches of source code are done to stabilize the
code that will go to production. A sort of data
model branch is also needed. deltasql provides a
simple way to collect all scripts that change the
data model and means to handle data model
branches. The deltasql server runs on Apache and
is backed by MySQL.